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Szekeres · source-snapshot-bc3404156f6e
已登记出处中的最早位置:§9.4 · zh-CN。
来源短摘录与定位
§9.4 · zh-CN · translation · unreviewed
称为洛伦兹规范(Lorentz gauge)。由于非齐次波动方程式 (9.50)的解总是局部存在的,因此若愿意,我们总可以采用洛伦兹规范。然而应当指出,四维势并不由洛伦兹规范条件式 (9.51)唯一确定,因为仍然可以再加上一个梯度,只要是波动方程的解。这被称为洛伦兹规范中可用的规范自由度。
§9.4 · en · original_transcription · unreviewed
is called a Lorentz gauge. Since solutions of the inhomogeneous wave equation Eq. (9.50) are always locally available, we may always adopt a Lorentz gauge if we wish. It should, however, be pointed out that the 4-potential is not uniquely determined by the Lorentz gauge condition Eq. (9.51), for it is still possible to add a further gradient provided is a solution of the wave equation, . This is said to be the available gauge freedom in the Lorentz gauge.